Muscle Contractions Video Lessons

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Problem: Why is Ca2+ important to the process of sarcomere shortening?A. Ca2+ binds to the troponin complex, which results in exposure of the myosin binding sites on actin.B. Ca2+ moves the tropomyosin molecule, which results in exposure of the myosin binding sites on actin.C. Ca2+ binds to the phosphate and helps to remove it from the myosin head.D. Ca2+ is a cofactor in the binding and hydrolysis of ATP.

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Tropomyosin and Troponin Regulation:

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Problem Details

Why is Ca2+ important to the process of sarcomere shortening?

A. Ca2+ binds to the troponin complex, which results in exposure of the myosin binding sites on actin.

B. Ca2+ moves the tropomyosin molecule, which results in exposure of the myosin binding sites on actin.

C. Ca2+ binds to the phosphate and helps to remove it from the myosin head.

D. Ca2+ is a cofactor in the binding and hydrolysis of ATP.

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